Andy:
Fair question.
I relished the opportunity to finally play Portrush when I visited the Emerald Isle for the first time last September. In fact, Portrush was my first first stop.
Clearly, the dunes like land and the rolling terrain is awesome stuff and it will stir the blood long before you play the first tee shot.
Unfortunately, someone or somehow the notion that fairways have to be sooooooooooo narrow and then topped off with some of the most demanding rough I have played -- the stuff at Portrush makes what Bethpage Black has look like a toga party!
When golf becomes "either or" type stuff then it can't really offer the strategic elements to the max. The sad fact is that a layout like Dunluce doesn't need man's help to be as great as it is.
When you narrow fairways to that extreme the issue of skill becomes less and less of an issue. In my mind -- recovery cannot be reduced systematically to nothing more than a SW or PW hack out of the junk in most situations. To be clear -- I'm not advancing the lame idea that a player should have a clear go at the green / target with no punishment but proportionality was definitely lacking when I played Portrush.
Interestingly enough -- County Down was not that case and people of substance have declared County Down to be a great driving test and I concur. You do have a fair but not overly generous area at County Down -- the Dunluce Links doens't need to be deemed a contrivance because the sheer qualities the course has can more than hold their own.
P.S. Andy -- the stuff at Glenbrook is so subtle that no one --minus you perhaps
-- will notice what you claim to be there!